HKBWS BBS 香港觀鳥會新聞組


    
      
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        Special Topics 特別主題 >> Tern Conservation 燕鷗保育 >>  Whiskered Tern 鬚浮鷗
        
(Message started by: 648 on Nov 4^th, 2002, 9:30pm)

Title: Whiskered Tern 鬚浮鷗
Post by 648 on Nov 4^th, 2002, 9:30pm

178 Whiskered Tern 鬚浮鷗
尖鼻咀 Tsim Bei Tsiu
03/11/2002
http://www.hkbws.org.hk/fileServer/PhotoG/648/648tern01.jpg

1.在水面振翅拍翼,把咀伸入水中.
2.飛行穩定告有飄然的感覺,下咀基部紅色.
3.只發現一隻.
白翅浮鷗還是普通燕鷗 ? White-winged Black Tern or Common Tern?

Title: Re: 請問這是甚麼鷗?
Post by kwan on Nov 4^th, 2002, 10:18pm

I may consider it as a whiskered tern. Let's see the comments from the more experienced birders.

Title: Re: 請問這是甚麼鷗? White-winged Black Tern or Com
Post by pelican on Nov 5^th, 2002, 2:08am

::)648!這真是一幅動人的照片.
我同意KWAN的講法,因為普通燕鷗的尾部一般用比浮鷗長而開叉,再者香港所見到的普通燕鷗的咀和腳一般都是黑色而不是紅的,所以我應為這不是普通燕鷗.

另外,我應為這是其中一種浮鷗的幼鳥.因為相片的鳥冀背和背上都有褐斑,而鬚浮鷗幼鳥的褐斑應比白翅浮鷗的少和疏.所以我應為這是鬚浮鷗

這可只是本人的意見啊!!!各位鳥友又有何意見呢,請多多作出提點!!!多多指教!!! ;D　

This was a lovely pic.
I agree with what KWAN said!Since Common Tern seens to have a longer and deeper folk tail. Besides, Common Tern mostly found in Hongkong, its bill and legs are black in color.

And I think that it was possibly a juenvile bird as you can find some dot on its back or even on its wings .Dots are rare and more separate in Whiskered Tern rather than White-winged Black Tern. Therefore, Whiskered Tern will be the answer!

That's only my option!! If there is any things wrong, pls let us know!!! ::)

Title: Re: 請問這是甚麼鷗? White-winged Black Tern or Com
Post by 648 on Nov 5^th, 2002, 9:01pm

謝謝KWAN兄、pelican兄！
據香港及華南鳥類一書 P.119, whiskered tern的幼鳥整個咀部為紅色,而這隻鳥只有下咀基部為紅色,再貼一張.
http://www.hkbws.org.hk/fileServer/PhotoG/648/648tern02.jpg

Title: Re:White-winged Black Tern or Common Tern
Post by Paul Leader on Nov 6^th, 2002, 9:54pm

I agree, it looks like a juvenile Whiskered Tern. This is based on a combination of the lack of dark leading edge to the wing, poorly defined cap (especially above the eye), short black patch on ear coverts, and rather pale mantle. Both Common and White-winged terns show an obvious dark leading edge, and White-winged shows a very dark mantle. I disagree however, about the tail fork depth (as it can be quite shallow on juvenile Common Tern, and is difficult to see in the photos), and would like to point out that bare part colouration (bill and legs) fits juvenile Common Tern, especially of the race tibetanus.